A professor claims the average class size at a university is

A professor claims the average class size at a university is greater than 35 students because a reason sample of 18 classes continued at average of 38.1 students. Assume the class size disturbution is normal with a population standard deviation of 7.6 students. Test the claim by comparing the P.value to the a= 0.01 signification level. use the z-tables

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